CC BY-NC-ND 4.0 · Ultrasound Int Open 2019; 05(01): E27-E33
DOI: 10.1055/a-0783-2170
Original Article
Eigentümer und Copyright ©Georg Thieme Verlag KG 2019

Gastric Emptying of Low- and High-Caloric Liquid Meals Measured Using Ultrasonography in Healthy Volunteers

Tarek Mazzawi
1   Department of Medicine, Haukeland University Hospital, Bergen, Norway
2   Clinical Medicine, University of Bergen, Bergen, Norway
,
Emily Bartsch
2   Clinical Medicine, University of Bergen, Bergen, Norway
,
Sara Benammi
2   Clinical Medicine, University of Bergen, Bergen, Norway
,
Rosa Maria Carrasco Ferro
2   Clinical Medicine, University of Bergen, Bergen, Norway
,
Ekaterina Nikitina
2   Clinical Medicine, University of Bergen, Bergen, Norway
,
Nancy Nimer
2   Clinical Medicine, University of Bergen, Bergen, Norway
,
Lara Jiménez Ortega
2   Clinical Medicine, University of Bergen, Bergen, Norway
,
Charles Perrotte
2   Clinical Medicine, University of Bergen, Bergen, Norway
,
Joäo Vitor Pithon
2   Clinical Medicine, University of Bergen, Bergen, Norway
,
Safira Rosalina
2   Clinical Medicine, University of Bergen, Bergen, Norway
,
Alexis Sharp
2   Clinical Medicine, University of Bergen, Bergen, Norway
,
Reza Stevano
2   Clinical Medicine, University of Bergen, Bergen, Norway
,
Jan Gunnar Hatlebakk
1   Department of Medicine, Haukeland University Hospital, Bergen, Norway
2   Clinical Medicine, University of Bergen, Bergen, Norway
,
Trygve Hausken
1   Department of Medicine, Haukeland University Hospital, Bergen, Norway
2   Clinical Medicine, University of Bergen, Bergen, Norway
› Author Affiliations
Further Information

Correspondence

Dr. Tarek Mazzawi
Haukeland University Hospital
Medicine, Gastroenterology
Jonas Lies vei 65
5021 Bergen
Norway   
Phone: +47/559/75 000   

Publication History

received 08 May 2018
revised 23 September 2018

accepted 27 October 2018

Publication Date:
07 January 2019 (online)

 

Abstract

Purpose

Delayed gastric emptying is present in patients with functional dyspepsia (FD), diabetes mellitus, and neurological diseases. Diet may affect gastric emptying symptoms in patients with FD. We sought to determine the extent to which gastric emptying and symptoms of dyspepsia are influenced by caloric content in healthy subjects using ultrasonography.

Materials and Methods

32 healthy volunteers were given 2 meals with different caloric content in random order. Gastric emptying was determined using ultrasonography to measure antral area when fasting, and postprandially at intervals of 0, 10, 20, and 30 min. Dyspeptic symptoms including discomfort, nausea, and fullness were graded.

Results

The antral area following a high-caloric meal compared to a low-caloric meal was significantly increased at 0, 10, 20, and 30 min (P=0.0203,<0.0001<0.0001,<0.0001, respectively), as was the median fullness (P<0.0048, 0.0001, 0.0009, 0.0001, respectively) measured at the same time points. There was a weak correlation (r2=0.1, P<0.0001) between the antral area and subjective fullness. No differences between gastric emptying in males and females were found.

Conclusion

The caloric content of a meal influences gastric emptying. Using ultrasonography to measure the antral area helps us to assess gastric emptying and therefore to assess patients with functional dyspepsia.


#

Introduction

Functional dyspepsia (FD) is a gastroduodenal disorder that presents with symptoms despite having no organic, systemic, or metabolic cause [1]. It is characterized by epigastric pain or discomfort, postprandial fullness, early satiety, and nausea [2]. Upper gastrointestinal symptoms such as nausea, belching, or abdominal bloating can also occur [3]. At least 20% of the general population experiences symptoms of dyspepsia, and a majority of those people are believed to have FD [1] [4]. Patients with FD experience reduced quality of life and there are significant costs to the healthcare system [5].

The underlying mechanism behind FD includes poor receptive accommodation of the proximal stomach, visceral hypersensitivity, and delayed gastric emptying [6]. The symptoms in patients with delayed gastric emptying worsen following meals high in fat, mass, and/or high in calories [7]. Therefore, patients with FD eat fewer meals and consume less total energy and fat than their healthy counterparts [8]. Gastric emptying is delayed in approximately 30% of patients with FD [9] as well as 30–50% of patients with longstanding diabetes mellitus [10]. Therefore, the measurement of gastric emptying may be useful in understanding the severity of dyspeptic symptoms.

The gold standard for measuring gastric emptying is scintigraphy [11]. Other reliable methods include the octanoic acid breath test [12], magnetic resonance imaging (MRI) [13], gastric aspiration techniques, epigastric impedance measurements, applied potential tomography [14], and paracetamol absorption test and other tracer methods [15]. Ultrasonography has been used for over 30 years to measure gastric emptying by observing the changes in cross-sectional antral area [16]. It has been suggested that the reliable location and identification of the gastric antrum makes it a particularly useful method of measurement [17]. Ultrasound is noninvasive, does not change the physiology of the gastrointestinal tract, and is widely available in outpatient settings [18].

The aims of this study were to evaluate gastric emptying in healthy volunteers following low- vs. high-caloric liquid meals as measured by the antral area (cm2) using ultrasonography, to explore whether the presentation of any dyspeptic symptoms is associated with delayed gastric emptying and to investigate if ultrasonography can also be used as a reliable method in clinical practice to assess gastric emptying in healthy volunteers (based on what is previously known concerning the physiological gastric emptying of low- vs. high-caloric liquid meals).


#

Materials and Methods

Participants

From 2015 to 2017, 32 healthy volunteers aged 19 to 35, with a median age of 22, were recruited to participate in the study at the Division of Gastroenterology, Haukeland University hospital, Bergen, Norway. A senior gastroenterologist (T.H.) performed an ultrasound scan of the abdomen and pelvic regions of each participant to rule out the presence of any abnormalities. The researchers completing the ultrasound were medical students that did not have extensive previous experience with ultrasound that were supervised by a gastroenterologist (T.M and T.H) to limit the inter-examiner variability, answer any questions and to confirm the location of the antrum.


#

Meals

Two beverages were used in this study. The first was a low-caloric meal using 400 ml commercial meat soup (Toro clear meat soup, Rieber & Søn A/S, Bergen, Norway) that was prepared with boiling water (100°C) then cooled to room temperature. The soup was cooled to prevent changes in gastric emptying rate that may be associated with very hot or very cool temperatures [19]. The second beverage was a high-caloric meal using two 200 ml nutritional juice supplements (Nutridrink Juice style, Nutricia AS, Oslo, Norway). The juice was consumed at room temperature. The nutritional characteristics of both meals can be found in [Table 1].

Table 1 Nutritional characteristics of low- and high-caloric meals.

Low-caloric soup (400 ml)

High-caloric drink (400 ml)

Protein

1.5 g

15.6 g

Fat

1.0 g

0.0 g

Carbohydrate

3.5 g

134 g

Salt

4.8 g

0.08 g

Calories

30 kcal

600 kcal


#

Study design

Each participant fasted for a minimum of 4 h prior to the study. The participants were randomized [20] to begin with either the low- or high-caloric liquid meal. Each participant drank the beverage within 2 min. Immediately after finishing the meal, the participants were asked about their dyspeptic symptoms, and the antral area was recorded. Ultrasonography (Logic E9 ultrasound scanner General Electric Healthcare, Milwaukee, WI, 4-MHz curvilinear probe) was used to measure the cross-sectional area of the antrum of the stomach. The cross-sectional area of the antrum, abdominal aorta and superior mesenteric vein served as landmarks, [Fig. 1]. The outer profile of the antrum was measured using the built-in caliper and calculation program of the ultrasound apparatus. The measurements were performed between antral contractions while the participants suspended their breathing in expiration. A minimal amount of force was applied during each reading to prevent compression of the antrum. In addition, it was ensured that all participants were kept in the same-seated position throughout the experiment, as it has been shown that body position may influence postprandial perceptions, gastric emptying, and intragastric meal distribution [21]. To ensure the accuracy of the results, the measurements were taken twice and then averaged.

Zoom Image
Fig. 1 Representative ultrasonography image (this image was taken 10 min after a low-caloric liquid meal). Landmarks: A: liver, B: superior mesenteric vein, C: gastric antrum and D: aorta.

The antral area was measured at 5 different time points: in the fasting state, immediately following liquid meal intake (0 min), and at 10, 20, and 30 min postprandially. At each time point, the participants were asked to record the severity of each dyspeptic symptom (discomfort, fullness, and nausea) on a Likert scale from zero (absence of symptoms) to 10 (maximum severity). 2–6 days later the participants drank the opposite meal and the same protocol was repeated.

The study was approved by the Regional Ethics Committee of western Norway (ref.nr.: 2016/1206).


#

Statistics

The statistical software used for this project was GraphPad Prism 7.00. Normal distribution of the data was assessed using the D’Agostino & Pearson normality test complemented by a graphical method (histograms). The comparison of the antral area following low- and high- caloric meals was done at each time point using a Tukey’s multiple comparison test (area under the curve). The same statistical test was performed to compare the antral area of females and males at each time point. Each participant served as their own control when comparing antral areas at different time points.

Moreover, the median fullness, nausea and discomfort following low- and high-caloric meals were compared at each time point using a non-parametric test, Wilcoxon signed-rank test. Median and interquartile ranges were calculated for the symptoms of dyspepsia at each time point for both the low- and high-caloric meal. Using a linear regression model, we also calculated the correlation (r2) with corresponding P-value between the antral area and subjective fullness.


#
#

Results

The weight and height of each participant were measured and the body mass index (mean±SD) was 22.56±2.51kg/m2. The antral area was significantly larger after the high-caloric meal compared to the low-caloric meal, at 0, 10, 20, and 30 min ([Fig. 2], [Table 2]). The antral area after the high-caloric liquid meal stayed relatively constant in each postprandial measurement compared to the antral area after the low-caloric liquid meal, which decreased at a faster rate. The difference between 30 min and 0 min in the case of the high-caloric meal was 1.487 cm2 , whereas the same difference in the low-caloric meal was 6.497 cm2. Differences between the means of the antral areas after a low- and a high-caloric liquid meal were calculated with a 95% confidence interval (CI). The difference in antral area increases between a high- and a low-caloric meal over a 30-min postprandial period. Moreover, the CI at each time point does not come in contact with the x-axis, therefore, indicating the significance of the findings, [Fig. 3]. There was no significant difference in antral area during fasting (P=0.9705).

Zoom Image
Fig. 2 Antral area (cm2) following low-caloric and high-caloric liquid meals, measured at fasting and 0, 10, 20, and 30 min post-meal (error bars=standard deviation).
Zoom Image
Fig. 3 The differences in the changes of the antral area (cm2) following a low-caloric and a high-caloric liquid meal, measured at 0, 10, 20, and 30 min post-meal (error bars=95% confidence interval).

Table 2 Antral area between a low- and high-caloric liquid meal, measured in fasting state and postprandially at intervals of 0, 10, 20, and 30 min.

Meals

Fasting

0 min

10 min

20 min

30 min

P*

P** 

P***

P**** 

P*****

P****** 

P****** 

Low caloric

3.371±1.802

12.179±4.910

9.002±3.539

7.314±3.130

5.683±2.555

<0.0001

<0.0001

<0.0001

0.0036

0.0273

0.0001

<0.0001

High caloric

3.076±1.753

14.774±5.702

14.220±5.311

13.018±4.890

13.288±5.107

<0.0001

<0.0001

<0.0001

<0.0001

0.9614

0.4075

0.5545

Data: Mean±SD. 2-way ANOVA with Tukey’s multiple comparisons test. P* antral area measured in fasting state compared to the antral area at 0 min; P**  antral area measured in fasting state compared to the antral area at 10 min; P*** antral area measured in fasting state compared to the antral area at 20 min; P****  antral area measured in fasting state compared to the antral area at 30 min; P***** antral area measured at 0 min compared to the antral area at 10 min; P******  antral area measured at 0 min compared to the antral area at 20 min; P******  antral area measured at 0 min compared to the antral area at 30 min.

The median results at all times for low- and high-caloric liquid meals in both nausea and discomfort were 0, and the results showed no significant difference in nausea between low- and high-caloric liquid meals. There was only one significant difference with respect to discomfort at the 10-min interval. The median fullness scores are shown in [Table 3]. There was no significant difference with respect to fullness during the fasting state. While participants ingesting the high-caloric meal reported a relatively constant sensation of fullness throughout the intervals, participants consuming the low-caloric meal reported a steady decrease in fullness at each interval, [Fig. 4].

Zoom Image
Fig. 4 Median of fullness, on a scale of 0-10, between low-caloric and high-caloric liquid meals, taken at fasting and 0, 10, 20, and 30 min after a meal (error bar=interquartile range).

Table 3 Dyspeptic symptoms (median ±IQR) following a) a low-caloric and b) a high-caloric liquid meal.

Symptom

Median (IQR) following a low-caloric meal

Fasting

0 min.

10 min.

20 min.

30 min.

Discomfort

0.0 (0.0, 0.0)

0.0 (0.0, 0.0)

0.0 (0.0, 0.0)

0.0 (0.0, 0.0)

0.0 (0.0, 0.0)

Nausea

0.0 (0.0, 0.0)

0.0 (0.0, 0.0)

0.0 (0.0, 0.0)

0.0 (0.0, 0.0)

0.0 (0.0, 0.0)

Fullness

0.0 (0.0, 1.0)

4.0 (1.0, 6.0)

3.0 (2.0, 5.0)

2.5 (1.0, 4.8)

1.00 (1.0, 4.0)

Symptom

Median (IQR) following a high-caloric meal

Fasting

0 min.

10 min.

20 min.

30 min.

Discomfort

0.0 (0.0, 0.0)

0.0 (0.0, 1.0)

0.0 (0.0, 1.0)

0.0 (0.0, 0.0)

0.0 (0.0, 0.0)

Nausea

0.0 (0.0, 0.0)

0.0 (0.0, 0.0)

0.0 (0.0, 0.0)

0.0 (0.0, 0.0)

0.0 (0.0, 0.0)

Fullness

0.0 (0.0, 1.8)

5.0 (3.0, 8.0)

5.00 (4.0, 6.8)

5.0 (3.0, 6.0)

4.00 (3.0, 6.0)

When values of all antral area measurements from both low- and high-caloric liquid meals were gathered and compared to the reports of subjective fullness, the data shows that there was a weak correlation (r2=0.1, p<0.0001) between antral area and subjective fullness for both the low- and high-caloric liquid meals, [Fig. 5]. However, there was no correlation between antral area and the other dyspeptic symptoms (nausea and discomfort).

Zoom Image
Fig. 5 The relationship between subjective fullness, rated on a scale from 0 to 10, and antral area (cm2).

There were no significant differences in the antral area between males and females after consumption of a low-caloric meal ([Table 4], [Fig. 6]) or a high-caloric meal ([Table 5], [Fig. 7]).

Zoom Image
Fig. 6 Antral area in females and males before and after eating a low-caloric meal measured at fasting and 0, 10, 20 and 30 min.
Zoom Image
Fig. 7 Antral area in females and males before and after eating a high-caloric liquid meal measured at fasting and 0, 10, 20 and 30 min.

Table 4 Antral area between females and males in fasting state and postprandially using a low-caloric liquid meal, at intervals of 0, 10, 20, and 30 min.

Time (min)

Females

Males

P-value

Fasting

3.16±1.56

3.85±2.76

0.46

0

11.36±6.16

10.35±2.68

0.69

10

9.16±1.05

8.4±4.04

0.69

20

7.77±3.34

6.67±3.59

0.49

30

5.48±2.36

5.47±3.24

0.99

Data: Mean±SD. Multiple t test.

Table 5 Antral area between females and males in fasting state and postprandially using a high-caloric liquid meal, at intervals of 0, 10, 20, and 30 min.

Time (min)

Females

Males

P-value

Fasting

2.54±1.48

4.02±2.79

0.11

0

15.62±6.5

14.93±5.97

0.81

10

14.97±6.5

14.85±5.76

0.97

20

13.63±4.7

13.82±6.38

0.94

30

14.65±5.9

11.93±5.35

0.31

Data: Mean±SD. Multiple t test.


#

Discussion

The current study on the usage of ultrasonography for determining the antral area of the stomach of healthy participants before and after low- and high-caloric meals shows that gastric emptying is more rapid in the case of a low-caloric meal compared to a high-caloric meal. Furthermore, the antral area recedes to nearly the fasting size after 30 min following the consumption of a low-caloric meal.

The antral area was significantly larger following the consumption of a high-caloric meal compared to that after a low-caloric meal, suggesting slower gastric emptying in the case of a high-caloric meal, which is consistent with previous publications [22] [23] [24] [25]. In fact, at 30 min the antral area following consumption of a low-caloric meal receded to nearly the fasting size. A similar relationship can also be observed with fullness. Fullness is a normal sensation that can be expected after a meal, and thus does not necessarily indicate the presence of dyspepsia [26]. Therefore, it was not expected that healthy participants would experience nausea or discomfort after either meal. Fullness was significantly higher after high-caloric meals than low-caloric meals. However, it is important to note that there may be other factors contributing to feelings of fullness between the 2 meals. For example, research shows that salivation, swallowing, and tasting, all assess oral food intake and inhibit the hypothalamus-feeding center [27].

Furthermore, a weak correlation between antral area and subjective fullness was found when observing results for both low- and high-caloric meals. Although a small connection between these 2 factors exists, this relationship does not determine a fixed trend in which the antral area can be accurately predicted based on subjective fullness alone. In addition, each individual perceives fullness uniquely, which adds variability to the ratings of fullness.

Previous research suggests that there may be a difference in gastric emptying in females between the follicular and luteal phases of the menstrual cycle. For example, one study found gastric emptying to be slower during the luteal phase compared to the follicular phase [28]. On the other hand, other studies denied any relationship between gastric emptying and the menstrual cycle [29]. However, with the small sample size, we were not able to find any statistical differences between males and females.

Using ultrasound easily aids in determining the antral area in patients with FD [9]. Since antral area<5 cm2 in the fasting state is considered normal [30], values more than that may indicate FD. Functional ultrasonography is an easy, effective and noninvasive modality that can be used in clinical practice to evaluate gastric emptying in both healthy patients and those with conditions such as diabetes mellitus and gastrointestinal disorders, such as FD [31]. Compared to scintigraphy, the gold standard for gastric emptying measurements, ultrasound is less expensive, and there is no exposure to ionizing radiation [32]. Furthermore, ultrasound allows real-time imaging with conveniently mobile instruments and it can be combined with many other procedures to broaden its applications [33]. In addition, the “gold standard” title is being challenged by 3D ultrasound. This technique has proven itself more accurate and less variable than standard 2D ultrasound, especially when visualizing the entire stomach and measuring volumes [34]. Gentilcore and colleagues found no significant difference for 3D ultrasound with scintigraphy for the measurement of gastric emptying rate [35].

Limitations

The participants were randomized to have either a high- or a low-caloric meal first. In hindsight, it would have been valuable for the researcher completing the ultrasound to also be blinded to the caloric value of the meal.

We realized that gastric function and emptying might change according to the time of the day. However, with the short nature of this study, we were not able to limit the ultrasound examinations to a certain time of the day.

It occasionally took up to 3 min to obtain 2 readings of the antrum with the abdominal aorta and superior mesenteric vein visualized. However, this challenge occurred in trials of both high and low calories, therefore providing consistency.


#
#

Conclusion

Ultrasound is a noninvasive, non-radiating and inexpensive method for the assessment of gastric emptying by measuring the gastric antral area. This technique is easy to master, even by medical students, and it allows us to find the same trend, which is supported by other studies performed with a gold standard test, without any exposure to radiation. These findings may help guide potential dietary recommendations for patients experiencing symptoms of dyspepsia, as well as aid in future research regarding the subject.


#
#

Conflict of Interest

No conflict of interest has been declared by the authors.

Acknowledgements

Dr. Odd Helge Gilja for his support throughout this program, Dr. Kim Nylund for his assistance with ultrasound. For the participants in the study, who made this project possible and IFMSA for enabling this exchange.

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Correspondence

Dr. Tarek Mazzawi
Haukeland University Hospital
Medicine, Gastroenterology
Jonas Lies vei 65
5021 Bergen
Norway   
Phone: +47/559/75 000   

  • References

  • 1 Tack J, Talley NJ, Camilleri M. et al. Functional gastroduodenal disorders. Gastroenterology 2006; 130: 1466-1479
  • 2 Lacy BE. Functional dyspepsia and gastroparesis: one disease or two?. The American Journal of Gastroenterology 2012; 107: 1615-1620
  • 3 Tack J, Talley NJ. Functional dyspepsia--symptoms, definitions and validity of the Rome III criteria. Nature reviews Gastroenterology & Hepatology 2013; 10: 134-141
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Fig. 1 Representative ultrasonography image (this image was taken 10 min after a low-caloric liquid meal). Landmarks: A: liver, B: superior mesenteric vein, C: gastric antrum and D: aorta.
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Fig. 2 Antral area (cm2) following low-caloric and high-caloric liquid meals, measured at fasting and 0, 10, 20, and 30 min post-meal (error bars=standard deviation).
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Fig. 3 The differences in the changes of the antral area (cm2) following a low-caloric and a high-caloric liquid meal, measured at 0, 10, 20, and 30 min post-meal (error bars=95% confidence interval).
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Fig. 4 Median of fullness, on a scale of 0-10, between low-caloric and high-caloric liquid meals, taken at fasting and 0, 10, 20, and 30 min after a meal (error bar=interquartile range).
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Fig. 5 The relationship between subjective fullness, rated on a scale from 0 to 10, and antral area (cm2).
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Fig. 6 Antral area in females and males before and after eating a low-caloric meal measured at fasting and 0, 10, 20 and 30 min.
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Fig. 7 Antral area in females and males before and after eating a high-caloric liquid meal measured at fasting and 0, 10, 20 and 30 min.